Simulation of sonoreators accounting for dissipated power

Louisnard, Olivier; Garcia-Vargas, Igor

doi:10.1016/b978-0-323-91937-1.00021-9

Cited by 5 publications

(12 citation statements)

References 81 publications

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“…It was therefore confirmed that the presence of the second zone along the shaft of the horn was related to radial movement of the horn, which expands and contracts while sonicating a solution. Louisnard and Garcia-Vargas attributed this to the “flow of acoustic energy through the lateral boundaries of the transducer” [21] .…”

Section: Resultsmentioning

confidence: 99%

“…The radial displacement was assumed constant and equal to 10% of the axial horn displacement, in order to achieve the best correlation to experimental data. In the work of Louisnard and Garcia-Vargas [21] a similar experimental configuration was modeled, and for horn immersion depth higher than 30 mm their model predicted ≈12% of energy input originating from the lateral walls of the horn. The obtained simulation results can be seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The Mach number (

) was estimated, by solving the Keller-Miksis equation (Eq. (10) ) which was used to compute radial oscillations for different initial bubble radii and acoustic pressure amplitudes (

) [21] , [22] , [33] .

…”

Section: Numerical Sectionmentioning

confidence: 99%

“…Simplified linear equations aim at facilitating implementation and reducing the overall computational requirements. Nevertheless, rigorous prediction of the acoustic pressure field remains challenging due to its coupling with the cavitational activity and its dynamic behavior [1] , [9] , [10] , [18] , [21] . Specifically, the acoustic energy of a travelling US wave inside a medium is lowered due to attenuation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Understanding the ultrasound field of high viscosity mixtures: Experimental and numerical investigation of a lab scale batch reactor

Bampouli,

Goris,

Van Olmen

et al. 2023

Ultrasonics Sonochemistry

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The Mach number (

) was estimated, by solving the Keller-Miksis equation (Eq. (10) ) which was used to compute radial oscillations for different initial bubble radii and acoustic pressure amplitudes (

) [21] , [22] , [33] .

…”

Section: Numerical Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Understanding the ultrasound field of high viscosity mixtures: Experimental and numerical investigation of a lab scale batch reactor

Bampouli,

Goris,

Van Olmen

et al. 2023

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

“…Cavitation is also expected to be less dominant at the selected high ultrasound driving frequency compared with the low frequency range, for which attenuation and nonlinear effects arise, see e.g. Louisnard & Garcia-Vargas (2022). Nevertheless, considering the computed acoustic pressure magnitude at the resonance peaks, which can reach tens of megapascals at 1 MHz, cavitation can still be expected.…”

Section: Discussionmentioning

confidence: 99%

Numerical analysis of dynamic acoustic resonance with deformed liquid surfaces: the acoustic fountain

Cailly,

Yin,

Kuhn

2023

J. Fluid Mech.

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Applying a focused ultrasonic field on a free liquid surface results in its growth eventually leading to the so-called acoustic fountain. In this work, a numerical approach is presented to further increase the understanding of the acoustic fountain phenomenon. The developed simulation method enables the prediction of the free surface motion and the dynamic acoustic field in the moving liquid. The dynamic system is a balance between inertia, surface tension and the acoustic radiation force, and its nonlinearity is demonstrated by studying the relation between the ultrasonic excitation amplitude and corresponding liquid deformation. We show that dynamic resonance is the main mechanism causing the specific acoustic fountain shapes, and the analysis of the dynamic acoustic pressure allows us to predict Faraday-instability atomisation. We show that strong resonance peaks cause atomisation bursts and strong transient deformations corresponding to previously reported experimental observations. The quantitative prediction of the dynamic acoustic pressure enables us to assess the potential of cavitation generation in acoustic fountains. The observed local high acoustic pressures above both the cavitation and the atomisation threshold hint at the coexistence of these two phenomena in acoustic fountains.

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Nonlinear ultrasound in liquid containing multiple coated microbubbles: effect of buckling and rupture of viscoelastic shell on ultrasound propagation

Nguyen

Kanagawa

2023

Nonlinear Dyn

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With promising applications in medical diagnosis and therapy, the behavior of shell-encapsula-ted ultrasound contrast agents (UCAs) has attracted considerable attention. Currently, second-generation contrast agents stabilized by a phospholipid membrane are widely used and studies have focused on the dynamics of single phospholipid shell-encapsulated microbubbles. To improve the safety and the efficiency of the methods using the propagation or targeted ultrasound, a better understanding of the propagation of ultrasound in liquids containing multiple encapsulated microbubbles is required. By incorporating the Marmottant–Gompertz model into the multiple scale analysis of two-phase model, this study derived a Korteweg–de Vries–Burgers equation as a weakly nonlinear wave equation for one-dimensional ultrasound in bubbly liquids. It was found that the wave propagation characteristics changed with the initial surface tension, highlighting two notable features of the phospholipid shell: buckling and rupture. These results may provide insights into the suitable state of microbubbles, and better control of ultrasound for medical applications, particularly those that require high precision.

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Simulation of sonoreators accounting for dissipated power

Cited by 5 publications

References 81 publications

Understanding the ultrasound field of high viscosity mixtures: Experimental and numerical investigation of a lab scale batch reactor

Understanding the ultrasound field of high viscosity mixtures: Experimental and numerical investigation of a lab scale batch reactor

Numerical analysis of dynamic acoustic resonance with deformed liquid surfaces: the acoustic fountain

Nonlinear ultrasound in liquid containing multiple coated microbubbles: effect of buckling and rupture of viscoelastic shell on ultrasound propagation

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